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q in (-oo:+oo)
(q+6)/7+(q-3)/7 = 0
q+q-3+6 = 0
2*q+3 = 0
(2*q+3)/7 = 0
(2*q+3)/7 = 0 // * 7
2*q+3 = 0
2*q+3 = 0 // - 3
2*q = -3 // : 2
q = -3/2
q = -3/2
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